What is the meaning of Riechen?

to smell (something); to sniff (something)

to use the sense of smell; to detect a smell

to smell something

to reek; to smell bad

to smell [with nach (+ dative) ‘like/of something’]

to tolerate (someone); to stand (someone)

to smoke, to steam, to smell, to smell pleasantly

[with accusative] to smell

Source: wiktionary.org